gplv3 by nonamea774

GPIO.hpp

#include "select.hpp"
#include <functional>

class GPIO{
public:
    GPIO(std::function<void(Button)> _callback);
    void waitButtonPushed(){
	callback(select.getPushedButton());
    }
private:
    std::function<void(Button)> callback;
    Select select;
};


GPIO::GPIO(std::function<void(Button)> _callback){
    callback = _callback;

    // GPIO の見えているファイルと, ボタンの関連付け
    select.addButton(Button::Zero, "/sys/class/gpio/gpio4/value");
    select.addButton(Button::One, "/sys/class/gpio/gpio7/value");
    select.addButton(Button::Two, "/sys/class/gpio/gpio8/value");
    select.addButton(Button::Three, "/sys/class/gpio/gpio9/value");
    select.addButton(Button::Four, "/sys/class/gpio/gpio10/value");
    select.addButton(Button::Five, "/sys/class/gpio/gpio11/value");
    select.addButton(Button::Six, "/sys/class/gpio/gpio17/value");
    select.addButton(Button::Seven, "/sys/class/gpio/gpio18/value");
    select.addButton(Button::Eight, "/sys/class/gpio/gpio22/value");
    select.addButton(Button::Nine, "/sys/class/gpio/gpio23/value");
}

select.cpp

#include "select.hpp"

void Select::addButton(Button buttonName, std::string fileName){
    auto fd = open(fileName.c_str(), O_RDONLY);
    buttonMap.push_back({buttonName, fd});
    char buff;
    read(fd, &buff, 1);
    lseek(fd, 0, SEEK_SET);
}

Button Select::getPushedButton(){
    fd_set fds;
    FD_ZERO(&fds);
    for(auto e: buttonMap){
	FD_SET(e.second, &fds);
    }
    select(buttonMap.size(), &fds, nullptr, nullptr, nullptr);
    for(auto e: buttonMap){
	auto fd = e.second;
	if(FD_ISSET(fd, &fds)){
	    char buff;
	    read(fd, &buff, 1);
	    lseek(fd, 0, SEEK_SET);
	    return e.first;
	}
    }
}

select.hpp

#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <string>
#include <algorithm>
#include <fcntl.h>

enum class Button{
    Zero,
    One,
    Two,
    Three,
    Four,
    Five,
    Six,
    Seven,
    Eight,
    Nine
};


class Select {
public:
    using FileDescriptor = int;
    Select() {}
    void addButton(Button buttonName, std::string fileName);
    Button getPushedButton();
private:
    std::vector<std::pair<Button, FileDescriptor>> buttonMap;
};